Modeling and Simulation of Fuel Cell Cogeneration System Based on Photovoltaic Hydrogen Production

Traditional fossil fuels are being used in large quantities and are rapidly running out, causing global environmental problems. Under the double pressure of energy consumption and environmental pollution, efficient and clean energy is urgently needed to replace traditional fossil energy. Solar energy has been more and more widely used as a green energy, but affected by seasonal and meteorological conditions, a single solar power generation is difficult to meet the load requirements. The combined heat and power system using hydrogen fuel cell can realize the power supply and heating to the user, and the comprehensive energy utilization rate is high. Therefore, the photovoltaic hydrogen production system and fuel cell cogeneration system are combined in this paper. When the solar energy is sufficient, hydrogen is produced and stored, and when the solar energy is insufficient, the stored hydrogen is used to supply the fuel cell cogeneration system. In this way, the thermal power supply is more stable and continuous and the energy efficiency is improved. The paper constructs a model of solar hydrogen production system which composed of photovoltaic cells, electrolytic cells and hydrogen storage tanks, and adds PID control to match the power of electrolyzer and photovoltaic cell. Then, on the basis of the completion of the model of proton exchange membrane fuel cell, the fuel cell cogeneration system is constructed after the heat storage tank, heat exchanger and other models are connected. Finally, after the solar hydrogen production system and the fuel cell cogeneration system are connected by the hydrogen storage tank, the fuel cell cogeneration system based on photovoltaic hydrogen production is constructed. Upon finishing all these steps towards the model construction, we then input four days of solar light intensity data and the user's heat and electricity usage data to accomplish a dynamic simulation of the system.