Simulation And Control Of Solid Oxide Fuel Cells

Solid oxide fuel cell(SOFC)is an energy device that converts chemical energy directly into electrical energy.It has the advantages of low noise,no pollution and high efficiency,and has a wide range of research prospects.In the daily use of batteries,both external load requirements and safe operation of batteries are required.Effective management and control of the thermoelectric characteristics of SOFC is conducive to prolonging the service life of batteries.For this reason,this paper takes kilowatt grade pure hydrogen tube SOFC as the research object,and conducts dynamic modeling and control research from thermoelectric aspects.In this paper,the following research is carried out:(1)Based on mass conservation,energy conservation and classical thermodynamic formulas,the thermal model and electrochemical model of nine-stage tubular solid oxide fuel cell were built.The influence of inlet current,hydrogen flow rate and air flow rate on the steady transient of battery power,voltage and temperature was analyzed.The results show that the model can reflect the real operation state of SOFC under both steady and transient conditions.(2)For the tubular solid oxide fuel cell model,a multi-input and multi-output model predictive controller is designed.Under the changing load current,the imported hydrogen and air are adjusted to keep the output voltage and temperature stable,and the fuel utilization ratio is within a reasonable range.The control results show that the model predictive controller has good effect on the model voltage and temperature control of solid oxide fuel cell with strong coupling and non-linear system.(3)Based on the established nine-stage tubular solid oxide fuel cell model,based on the non-linear synovial membrane controller and model predictive control,and with the current change rate as a new control variable,the air flow rate and hydrogen flow rate can be obtained under the condition that the water flow rate is determined and the current obtained by the controller.Under the premise that the fuel utilization rate remains stable,the battery can track the outside.Purpose of load power and temperature.The control results show that both of the two controllers can achieve good control effect,but the effect of the non-linear sliding film controller is better.