Research On Operation Control And Optimization Method Of Fuel Cell Hybrid Tram

In recent years,environmental protection and sustainable development have increasingly become key elements in the process of our country’s economic and social development.With the continuous research and development of energy systems,the application of new energy systems in various fields is gradually becoming an important way to achieve energy conservation and emission reduction.In the new energy systems,compared to traditional energy conversion devices,hydrogen fuel cells have the advantages of zero emissions,zero pollution,and high conversion efficiency,and they have great advantages in environmental friendliness.With the continuous advancement of economic development and urbanization,the demand for urban rail transit is also showing an upward trend.Therefore,the research on fuel cell trams is in line with the current research direction of urban rail transit technology,and it also has important environmental benefits for our society and country.This paper takes the fuel cell/supercapacitor hybrid electric tram as the research object,and studies the operation and control of the fuel cell hybrid power system and the tram respectively.According to the analysis of tram and optimization of the hybrid power system,this paper realizes the optimal control of both hybrid power system and the tram,which also makes reduce the costs of tram operation and maintenance.The main research work is as follows:Establishing and verifying the models of fuel cell system and supercapacitor system.For the proton exchange membrane fuel cell system,the system flow-channel mechanism model is constructed,and the net output power model of the fuel cell system is obtained based on parameter identification;for the supercapacitor,the first-order nonlinear and linear models are compared in this paper.On the basis of the first-order linear model,the constant-power charging and discharging model of the supercapacitor system is further studied.What’s more,the model of fuel cell system and supercapacitor system was verified in Matlab/Simulink software,and both of the identification model of fuel cell system and the first-order linear charging and discharging model of supercapacitor are verified in this paper.Building a multi-stack fuel cell system in RT-LAB platform and a 200 k W dual-stack fuel cell system platform.Based on the power consumption distribution functions of dual-stack and three-stack fuel cell systems,a method of power coordination based on analytical solution is proposed in this paper.According to iteration and algebraic transformation,on the basis of multi-stack optimization control,this method also realizes the real-time isolation of partial faults in the whole system,which greatly improvs the operational reliability of the multi-stack fuel cell system.This paper also verifies the effectiveness of the proposed method in the aspects of improving system efficiency and online fault handling based on the RT-LAB simulation platform and the 200 k W dual-stack fuel cell system platform.Building a set of high-power fuel cell/supercapacitor hybrid power system test platform.This paper proposes a local control method based on equivalent energy consumption method,based on the fuel cell and supercapacitor system model.This method constructs the dynamic energy consumption coefficient of the supercapacitor system.By analyzing and solving the extreme value of the energy consumption function in traction mode,coasting mode,braking mode and station charging mode of the hybrid power system,the energy distribution of the hybrid system is obtained,so as the real-time control.This paper uses RT-LAB simulation platform and hybrid power system test platform to verify that the proposed method has significant advantages in improving system efficiency and reducing fuel cell system output fluctuations.Based on the operating comfort,traction calculation and the model of traction power system,this paper studies the energy consumption distribution functions of the tram in different operating stages.By using the generalized Lagrangian algorithm to solve the above functions,the optimal speed curve of the hybrid tram under the fixed operating line parameters is obtained,which realize the optimization of energy consumption and the operation of the tram in the fixed station interval.This paper also realizes the operation of the tram on the established test railway based on the actual tram test,and verifies the effectiveness of the method proposed in this paper through comparative experiments.