Research On Fuel Cell Control Technology Of Organic Hydrogen Storage Liquid

Proton exchange membrane fuel cell（PEMFC）embodies the characteristics of clean environmental protection and relatively low operating temperature.Organic liquid hydrogen storage technology can realize the safe and efficient storage and transportation of hydrogen energy at room temperature and pressure,and reduce the cost of large-scale application of hydrogen energy.Therefore,proton exchange membrane fuel cell based on organic hydrogen storage liquid has become one of the most promising new energy fuel cells.Proton exchange membrane fuel cell based on organic hydrogen storage liquid has the characteristics of nonlinearity and difficult to determine parameters,which increases the complexity of control.The current research scheme is difficult to achieve effective control.It is necessary to study an effective control method to make it operate stably and meet the needs of practical engineering.In the proton exchange membrane fuel cell system,an important component of PEMFC power generation system is the gas supply system,which undertakes the task of providing reactants for the system.Due to the particularity that the hydrogen source of the system comes from the dehydrogenation reaction of organic liquid,it is necessary to accurately control the cathode air supply and anode hydrogen supply respectively.Through the analysis of the cathode air supply system,the oxygen ratio of the system is determined as the control target.Firstly,the traditional PID controller with simple structure is considered in this paper.It is found that it cannot achieve good control effect for nonlinear time-varying system due to fixed parameters.Then the fuzzy PID controller is designed by using the idea of fuzzy control.Compared with the traditional PID controller,it can achieve better control effect.Then,based on the lack of expert knowledge and experience of fuzzy PID,based on swarm intelligence algorithm,combined with differential evolution algorithm to design an improved particle swarm optimization algorithm,and optimize the fuzzy rule table,and finally achieve better control effect.For the anode hydrogen supply system,according to the characteristics of organic liquid dehydrogenation and the actual demand of the system,and considering the special conditions of the system startup stage,a timing device is designed to ensure a stable hydrogen supply.A PID controller with integral separation is designed.The integral link is cancelled when the deviation signal is large,and added when the deviation signal is small.This method can effectively improve the control accuracy and reduce the steadystate error.The output voltage of the fuel cell will change with the load current,which is difficult to meet the needs of the actual system.A power converter DC / DC is designed to convert the output voltage of fuel cell.Based on the simulation results,the DC/DC converter can convert the output voltage of fuel cell to 85 V,and the voltage ripple is less than 1% stable DC.