Research On Fuel Cell Hybrid Power Generation Systems

Energy is the basis for the development of human society, all the countries are developing and looking for clean and renewable energy to meet the need for energy, especially the urgent need for electricity.Renewable energy has advantages and disadvantages, and it is a mainstream direction to ensure the reliability and stability of the system that making a variety of new energy power generation methods complement with each other in the development and the utilization of new renewable energy.In this paper, the entire power generation system that consisted of fuel cells, solar and wind power generation technology was designed based on fuel cells.Firstly, the research progress of fuel cells,solar and wind energy was outlined in the paper. The three-dimensional model of proton exchange membrane fuel cell was simulated using PEM module with the software of Fluent. Based on the mathematical model of PEMFC, the parallel flow field geometry model was established and compared with the simulation and experimental values.The results showed that the simulation results and the experimental results were in good agreement. The gas composition, temperature, pressure and proton membrane thickness were researched by simulation and the results showed that within its operating range, the higher the temperature and pressure were, the better the battery performance was.The battery performance was optimal when the battery operating temperature was353K and the pressure was2atm, and the battery internal temperature changed less than3K. In this paper, Nafion112(51um) was used as the proton exchange membrane.The thinner and the easier wetting the proton membrane was, and the smaller the battery resistance was, the better the battery performance was. Countercurrent inlet can improve the current density of the battery better than downstream inlet. With the anode feed rate increased, the current density increased first and then tended to remain unchanged, and with the increased of the cathode feed rate, the current density increased first then there was a downward trend.Secondly, the sub-module of the fuel cell hybrid power generation system (fuel cell, solar and wind power generation) was simulated by MATLAB/Simulink. We can draw the various parts of the power output characteristic curves, and the power generation system was optimized to the best.Finally, fuel cells, wind power and solar energy hybrid power generation system were established using MATLAB/Simulink. The results showed that the fuel cell/super capacitor system had a good control of the instability on solar and wind in the system. When the temperature was15℃and the sunshine intensity was700W/m2, the PV had a higher DC voltage and DC current output. The simulation results showed that the fuel cell hybrid power system can maintain a good reliability and stability.