Operation Optimization And Control Method Of Fuel Cell Hybrid Tram

Carbon dioxide emissions from urban transportation systems account for a quarter of global emissions.Low-carbon,energy-saving and emission-reduction travel has become the main travel mode advocated by China in the field of transportation.With the continuous improvement of national environmental protection awareness,the use of clean,energy-saving and green transportation has become everyone’s first choice.In recent years,trams in the transportation field have developed rapidly due to their large passenger capacity,fast speed,high efficiency,and the use of electrical energy,environmental protection,and pollution-free.With the continuous improvement of people’s requirements for urban landscapes,the contactless power supply system has become the development direction of modern trams.Fuel cells are more in line with national environmental protection requirements because of their high efficiency and no pollution to the environment.The thesis takes hybrid electric tram as the research object,analyzes the system characteristics of the vehicle,optimizes the vehicle’s running speed curve,and combines the equivalent hydrogen consumption theory to study the optimal control method of the tram.It works as follows:Aiming at the researched hybrid fuel cell tram system,the key components of the power system were selected and analyzed in terms of topology.According to the design parameters and design requirements of domestic energy storage hybrid tram vehicles,traction calculations were performed to match the power system parameters.Under the Simulink simulation platform,a hybrid tram system model is built,and an RT-LAB real-time simulation system is designed to connect the energy management controller to the RT-LAB target machine to build a semi-physical test system to realize the tram power system Real-time simulation runs.Based on the output characteristics of the fuel cell system and the supercapacitor system under actual operating conditions,combined with the equivalent hydrogen consumption theory,a system equivalent total hydrogen consumption model was established,and the actual model was used to verify the correctness of the model.Based on the established fuel cell hybrid system model and hydrogen consumption model,a method of hierarchical operation of fuel cells is introduced to address the impact of the large amount of brake recovery energy of fuel cell trams on the stability of the energy storage system and fuel cell fluctuations.Based on the principle of equivalent hydrogen consumption,an optimization control method based on instantaneous minimum equivalent hydrogen consumption is proposed.The system’s operating efficiency,total hydrogen consumption,and fuel cell operating pressure will be improved to enhance the reliability of the fuel cell hybrid power system.The dynamic model of the tram is established,and the operating characteristics of the tram are analyzed based on the existing parameters of the tram system and the data of the running line,and a multi-objective mathematical model for train operation is established.In order to reduce the energy consumption during the operation of a fuel cell hybrid tram,a mathematical model for multi-objective optimization of tram movement is constructed by combining a tram dynamic model and a motion equation,and an intelligent optimization algorithm is used to perform optimization calculations to find the optimal The running speed curve of the train can achieve the energy-saving operation of the tram.The obtained optimal running speed curve can provide guidance and reference for the operation of fuel cell trams in the later stage,and further utilize the characteristics of the multiple energy sources of trams to optimize the energy consumption of the system from a global perspective.