Research On SOFC Extended Range Vehicle Control Based On Hardware-in-the-loop Platform

While cars bring convenience to people’s lives,they also have the problems of exhaust pollution and the increasing lack of fossil energy.In order to alleviate the exhaust pollution and energy crisis,it is a better choice to use electric vehicles instead of traditional internal combustion engines based on the development of green energy.However,due to the capacity limitation of current battery technology,the mileage of electric vehicles still cannot surpass that of traditional cars,and using a range extender to increase the mileage of electric vehicles is a feasible improvement method.Solid oxide fuel cell(SOFC)is an efficient,clean,and quiet power generation equipment that can directly convert chemical energy in fuel into electrical energy,which is a more ideal extended-range equipment compared to fuel generators.This paper takes the vehicle extended range system based on SOFC-lithium battery as the research object,studies the energy distribution control strategy of the extended range system and develops the actual controller on the topological structure,optimization analysis and control mode to increase Cheng system provides technical support.The specific work of this paper is as follows: The SOFC extended-range electric vehicle system model is built.The model includes the SOFC model,the electric vehicle power demand model,the power conversion DCDC model,and the hydrogen storage tank model.After the model building is completed,corresponding control is required.First,the SOFC control algorithm.In order to enable the SOFC output power to quickly track the set power,the corresponding power output control can be performed.The TS-GPC control algorithm is used to control the SOFC;followed by energy distribution Algorithm,in order to realize the simultaneous power supply of SOFC and lithium battery,this paper uses the finite state machine to determine the switching timing of the range extender,and design two energy distribution strategies when the range extender is turned on,namely the SOFC constant power control strategy and variable Power control strategy.The former sets the SOFC in a high-efficiency constant power mode.This strategy is relatively simple to control,and the output power of the SOFC does not need to be changed from the start of the extended range to the end.The latter simultaneously considers the output efficiency of SOFC and lithium batteries,designs corresponding objective functions,and uses particle swarm optimization(PSO)to obtain the optimal power allocation.On the basis of the completion of simulation,the relevant controller was designed based on Model Base Design(MBD),and a semi-physical platform was built to verify the effect of the controller.In the case of the BYD E5-300 car as the prototype in the simulation,the SOFC variable power strategy has a range extension of 90.69 km,which is slightly better than the constant power strategy of 87.29 km.The semi-physical verification found that the control system designed in this paper can complete the control goals of the SOFC system and the car range extension system,and achieve the operation of the car range extension system with high efficiency,which improves the cruising range of the car and extends the service life of the lithium battery system.