Integration And Control Of Backup Power System Based On 5kW Air-cooled PEMFC

With the advancement of China’s modernization and the improvement of people’s quality of life,Demand for electricity from all walks of life has risen accordingly.Individuals and businesses are increasingly buying backup power supplies,such as UPS,as emergency power supplies.However,with the emergence of energy crisis and environmental pollution,new energy power supplies stand out from the competition with traditional power supplies.Proton exchange membrane fuel cell(PEMFC)has become a key research direction in the field of backup power supply through its advantages such as pollution-free,low noise,and high energy efficiency.Based on previous researches on PEMFC backup power supply and a large number of market application cases,this paper has carried out the research and development of air-cooled PEMFC backup power supply.In this paper,the scheme of air-cooled PEMFC standby power systems is proposed,and the control of air-cooled PEMFC stack is studied.The hardware circuitry and software program of PEMFC standby power systems are designed.Then,set up and test the complete standby power prototype.The test results show,the PEMFC standby power has good performance and control strategy practical,effective to reached the design objectives and requirements of the system.The main research results of this article are as follows:(1)Designed a set of air-cooled PEMFC backup power system scheme.According to the design goals and requirements,the selection and design of the topology of the fuel cell backup power supply system,the PEMFC backup power supply system structure and system unit design,and the hydrogen supply system design were completed in the plan.(2)Based on the test platform,the PEMFC output characteristics,optimal temperature,and start-up research experiments were carried out,and the control of the air-cooled PEMFC in the backup power system was completed.In the PEMFC output characteristic experiment,it is found that the temperature of the PEMFC is reasonably controlled at the initial stage of the startup,otherwise the PEMFC will be damaged or performance degradation;after the PEMFC optimal temperature experiment,the operating temperature under different output currents is obtained,and fitting the data obtained in the relation with operating temperature and output current.considering that the optimal temperature control may have the risk of excessive temperature overshoot when the PEMFC is started,the start-up control strategy is studied experimentally.The experimental results found that the power can climb steadily.(3)According to the designed air-cooled PEMFC backup power supply system plan and control strategy research,designing the hardware circuit and software program of the system,completing the selection of key components of the system,and drawing the three-dimensional structure diagram of the backup power supply prototype.Then the prototype was assembled and an air-cooled PEMFC backup power supply prototype was developed.(4)Completed the prototype test of the air-cooled PEMFC backup power supply.The test results show that the prototype control strategy is reasonable,effective,stable,reliable and has good performance,and has high engineering practicability and promotion value.