Study On Energy Management Strategy Of Medium Fuel Cell Truck Power System

Fuel cell vehicles are known as new energy vehicles of the most promising,with long range,low noise,zero emissions and other characteristics.It has been widely concerned and studied in the automotive industry.In this paper,a medium-sized fuel cell truck is regarded as the research object.The increase of economy and the core components of the vehicle life have been mainly studied.The good vehicle driving energy management strategy and regenerative braking control strategy can effectively improve the vehicle fuel economy.The real-time wavelet transform control strategy can optimize the fuel cell output power,reduce its volatility,and improve the life of fuel cell.The main research contents are as follows:Firstly,the topological structure of the designed fuel cell vehicle power system has been determined by comparing the working characteristics of different power sources and the advantages and disadvantages of the combination forms of each power source.According to the vehicle parameters and dynamic performance indexes,the main components of the power system of fuel cell vehicles have been matched.The appropriate types,specific parameters and various efficiency curves have been determined,and the simulation model has been established accordingly.Secondly,the basic control ideas and principles of two driving energy management strategies for fuel cell vehicles,namely power following control strategy and fuzzy control strategy,are introduced.The vehicle drive energy management strategy model has been established.The simulation results show that the fuzzy control strategy improves the economy of the whole vehicle by about 1.9% compared with the power following control strategy.The control ideas and rules of three regenerative braking control strategies are analyzed,and the models of three regenerative braking control strategies are established.Compared with the ideal regenerative braking control strategy and the actual regenerative braking control strategy,the optimal regenerative braking control strategy respectively improves the vehicle economy by about 8.8% and 10.5%.Finally,it is found that the output power of fuel cell fluctuates greatly,which affects its service life,by analyzing the simulation results of power following and fuzzy control strategy.In this paper,a control strategy based on real-time wavelet transform has been proposed and a simulation model has been established.By comparing simulation analysis,the effectiveness of the control strategy based on real-time wavelet transform and the improvement of fuel cell output power fluctuation frequency are verified.The work of this paper provides ideas for the future research on fuel cell vehicles driving control strategy,regenerative braking control strategy and reducing the fluctuation frequency of fuel cell output power,which has certain reference value.