Research And Design Of Gas Supply System For Fuel Cell Range-Extender

Fuel cell range-extender is used to increase the one-time mileage of pure electric vehicle,that is,to add a fuel cell power generation system as another energy source on a pure electric vehicle.Currently,most of fuel cell range-extenders that have been embedded in pure electric vehicles use graphite plate fuel cell stacks imported from abroad,combined with normal pressure(non-back pressure)fuel cell accessory systems,and only output the constant power as a vehicle-mounted chargers to power the battery pack,not directly affecting the power output.Although the control method of normal pressure fuel cell range-extender is simple,there are insurmountability advantages of low volume power density,high requirements for humidification,and low durability of the system.In order to improve the power performance of the fuel cell extended-range electric vehicle,one no-external-humidifying,high-temperature,high-pressure,and high-power density fuel cell range-extender development plan,based on a metal bipolar plate fuel cell stack,is proposed by this project.This paper mainly focuses on research of gas supply control system of the high pressure fuel cell range-extender,and completes the design of gas supply control system for 25 kW Proton Exchange Membrane Fuel Cell(PEMFC)range-extender.And PID neural network decoupling algorithm and fuzzy PID algorithm are used to achieve independent control of air flow and pressure and hydrogen pressure follow-up control respectively.The main works achieved in this paper are as follows:Firstly,the domestic and foreign research status of fuel cell range-extender related technologies are summarized and analyzed,and the development plan for fuel cell range-extender with no-external-humidifying,high-temperature,high-pressure,high-power density is proposed.According to the functional requirements of this development plan for vehicle-borne environment,the overall design of the gas supply system for this fuel cell range-extender is completed.Secondly,in Matlab/Simulink environment,the simulation models of the proton exchange membrane fuel cell stack and gas supply system are built,and the output characteristics of the fuel cell stack and the control characteristics of the gas supply system are analyzed,and then the specific control requirements of gas supply system are put forward.Then,in order to achieve relatively independent air flow and pressure control,as well as the polar gas coordination control,intelligent decoupling control algorithms are analyzed with emphasis,and Matlab is used to simulate the different control algorithms discussed based on the established model,and the simulation results are analyzed in comparison.Finally,the software and hardware design of the gas supply control system are completed,and the experimental platform of fuel cell range-extender gas supply system is established.The rationality of the design of the structural scheme and the control scheme are verified through relevant experiments.The fuel cell extender gas supply control system designed in this paper achieves the purpose of decoupling control and coordinated control,and has valuable research and practice for the development of high-pressure,and high-power density fuel cell range-extender.