Research On Energy Management Strategy And Drive Control Of Fuel Cell Hybrid Electric Vehicle

With the increasingly serious problems of traditional energy scarcity and environmental pollution,as well as the increasing improvement of new energy utilization technologies,have made new energy vehicles attract widespread attention.Among them,fuel cell vehicles have the advantages of clean and environmental protection,low noise,and high energy efficiency,so it becomes an ideal research target.There are many problems in existing fuel cell vehicles,such as slow dynamic response of fuel cells,poor current tracking effects of DC converters,motor current loops that affect speed loop control,complex power distribution in multi-energy systems,and high hydrogen consumption.In response to the above problems,this paper chooses a multi-energy topology composed of fuel cells,batteries and supercapacitors;designs a data-driven basaed model-free continuous fast terminal sliding mode controller(MFCFTSMC)to control the DC converter;designs a acoordinated control method of speed loop continuous fast terminal sliding mode control and current loop based on data-driven model-free non-singular terminal sliding mode control(CFTSMC-MFNTSMC)to control the motor;a state machine strategy based on minimizing hydrogen consumption is designed to reduce the hydrogen consumption of the energy system.The specific research content of this article is as follows:(1)Modeling of fuel cell/battery/supercapacitor hybrid electric vehicle.First,to improve the dynamic response speed of the system,the fuel cell/battery/supercapacitor threeenergy topology is selected.Secondly,the forward simulation model of fuel cell hybrid electric vehicle is built in MATLAB/Simulink.(2)Design of a model-free continuous and fast terminal sliding mode controller based on data-driven.To improve the current tracking performance of the DC converter and maintain the voltage stability,a date-driven based model-free continuous fast terminal sliding mode controller(MFCFTSMC)is designed.First,the working principle of the DC converter is analyzed,and the component parameters are designed.Second,the MFCFTSMC is designed,and the robustness of the MFCFTSMC is proved by Lyapunov theory.Finally,the simulation results show that the proposed MFCFTSMC method is effective.(3)Cooperative control design of continuous fast terminal sliding mode control of speed loop and non-singular terminal sliding mode control of current loop.To improve the stability of the motor speed and reduce the influence of the current loop on the speed loop,a coordinated control method of continuous fast terminal sliding mode control of the speed loop and non-singular terminal sliding mode control of the current loop is designed.First,the mathematical models of permanent magnet synchronous motors in various coordinate systems are introduced.Second,a high-order fast sliding mode observer-based CFTSMC and a datadriven MFNTSMC are designed,and the stability of the proposed CFTSMC-MFNTSMC is demonstrated using Lyapunov theory.Finally,by comparing with the traditional PI-PI control method and CFTSMC-PI control,it is verified that the proposed CFTSMC-MFNTSMC has better rotational speed and current stability.(4)Design of state machine energy management strategy based on minimizing consumption.To reduce the hydrogen consumption of the energy system,a state machine strategy based on minimizing hydrogen consumption is designed.First,the optimal output power of the fuel cell is obtained.Secondly,considering the change of battery state of charge(SOC),the reference output power of the fuel cell is allocated according to the size of the load power.Finally,validated under new European driving cycle conditions,the results show that the proposed energy management strategy has better effect in reducing the hydrogen consumption of the energy system and controlling the battery SOC variation compared to the state machine strategy and the equivalent consumption minimization strategy.