Simulation Analysis And Control Of Multi-power System For Fuel Cell Hybrid Electric Vehicle

Energy source shortage and environment pollution arising from automobile industry have been given more and more attention all over the world .Development of new type motor vehicle with low energy consumption and emission is being under-way by automobile industry and research institute, which is encouraged by government policy. Fuel Cell Hybrid Electric Vehicle has many benefits, such as high efficiency and zero emission, which make it to become the hot point for the development of global electric vehicle, and tend to be the trend.Because the fuel cell system's dynamic response is very slow, it can't achieve the vehicles require of start-up, acceleration and upgrade. So an additional energy system is needed. The hybrid energy system combining battery and ultracapacitor could combine the high power density of ultracapacitor and the high energy of convenient batteries. Batteries are useful to provide long-time energy demanded by vehicle, ultracapacitor are used to provide the essentially high peak power and regenerate braking energy; meanwhile the life time of the hybrid system can also be longer than ever.The major research object of this paper was proton exchange membrane fuel cell hybrid electric vehicle, considering the power requirements of vehicle, a comprehensive experimental research was proceeded on proton exchange membrane fuel cell; Making control strategy of the vehicle's energy system; Using a indigenous economy class A sedan as a prototype, a comprehensive simulation analysis and parameters matching were proceeded on fuel cell–battery -ultracapacitor hybrid electric vehicle. The major research works and results of this paper as follows:A 500W low-pressure H2-Air fuel cell was tested on fuel cell test platform, the results indicated that the performance of fuel cells improved with the increase of fuel cell's operation temperature; The response of fuel cells was rapid when the load changed quickly; The performance of fuel cells was stable on full load of fuel cells; Fuel cells could start up quickly. In general, the performance of proton exchange membrane fuel cells could meet the requirement of vehicle.The combined system of batteries and ultracapacitors was modelled with Matlab/Simulink after researching the characteristic of them, and tested the system under pulse-power performance.According to the need of vehicle and the characteristics of the energy system's components, designed the control strategy and modelled it with Matlab/Simulink. Using the simulation software ADVISOR, basing on a indigenous sedan, the drivetrain components were chosen, parameters matching and performance simulation were also proceeded. The simulation results indicated that the control strategy is right. Compared with fuel cell-battery hybrid electric vehicle, the fuel economy of fuel cell–battery-ultracapacitor hybrid electric vehicle has improved; on the dynamic performance, the biggest speed has a little decreased, the accelerative time of 0-100km/h and the gradient have improved a lot.