Study On Fuel Cell Air Transmission System Control Methods

As an environmental friendly new energy technology,the development of Proton Exchange Membrane Fuel Cell(PEMFC)is widly valued.Among many fuel cell applications,hydrogen fuel cell vehicles have received extensive attention because of their high efficiency and cleanliness.The air transmission system is the most important factor affecting the dynamic characteristics of the fuel cell vehicles engine system.The nonlinear time-varying system which parameters change nonlinearly with the environment made the researching on the controlling of the air transport system in the actual environment more important significance.In this paper,an air transmission system experimental platform of 140 kW PEMFC had been built.Firstly,the performance of three-phase flux motor had been tested at different voltage levels.The results showed motor better performance on 350 V voltage.Secondly,The relationship among the motor torque,motor speed and air flow trend and response speed of the drive motor at 350 V supply voltage had been experimented,which showed the motor rotation and average air mass flow stability time in fixed motor torque change was about six seconds.Then,adjusted the experimental platform's pressure valve opening for simulating the effect of fuel cell stack pressure,made the same relationship between gas pressure of the pipeline and motor rotation speed with the air transport system in the fuel cell stack.Finally,a model between air flow and motor rotation speed is proposed based on the air temperature of the pipeline and the air pressure the pipeline as constraint.In this work,the PID and Multi-modal PID control method were applied to the air transmission system.The air mass-flow was acted the target variable for control research and achieved well control effect.Compared and analyzed the output response of PID and made better control parameters.Concluded that the Multi-modal PID control method consumes less energy compressed per unit air quality by comparing the result of the two control methods from the point by the energy-saving of the motor & compressor.